docs: Adding project diagrams link to README.MD (#120)

Adding a link to the high-level diagrams including module, library dependency and others (https://sourcespy.com/github/ch4mpyspringaddons/). Built directly from source and updated on schedule. Intended to simplify developer's introduction to the project.

In the spirit of transparency - I am the author of the diagrams. Hope contributors find it useful.

README.MD

@@ -38,7 +38,7 @@ This repo contains thin wrappers around `spring-boot-starter-oauth2-resource-ser
 - [spring-addons-webmvc-introspecting-resource-server](https://github.com/ch4mpy/spring-addons/tree/master/webmvc/spring-addons-webmvc-introspecting-resource-server) to be used in servlet REST APIs secured with access token introspection
 - [spring-addons-webmvc-jwt-resource-server](https://github.com/ch4mpy/spring-addons/tree/master/webmvc/spring-addons-webmvc-jwt-resource-server) to be used in **servlet REST APIs secured with JWT decoders**
 
-This starters are designed to push auto-configuration one step further. In most cases, you should need 0 Java conf. An effort was made to make [tutorials](https://github.com/ch4mpy/spring-addons/tree/master/samples/tutorials), Javadoc and modules READMEs as informative as possible. Please refer there for more details.
+This starters are designed to push auto-configuration one step further. In most cases, you should need 0 Java conf. An effort was made to make [tutorials](https://github.com/ch4mpy/spring-addons/tree/master/samples/tutorials), Javadoc and modules READMEs as informative as possible. Please refer there for more details. Additionally refer to [module, dependency, class and other diagrams](https://sourcespy.com/github/ch4mpyspringaddons/) for a general overview of the repository.
 
 ## 3. <a name="start"/>Where to Start
 [Tutorials](https://github.com/ch4mpy/spring-addons/tree/master/samples/tutorials) which cover: